/* Validacion de los datos de registros de usuarios*/
function validar_usuario(form)
{
    var nombre = trim(form.name.value);
    var email = trim(form.email.value);
    var comments = trim(form.comments.value);
    var errores = "";
    var res = true;

    if( (nombre==null) || (nombre==""))
    {
        errores += "Please enter your name\n";
        res = false;
    }

    if( (email==null) || (email==""))
    {
        errores += "Please enter your email\n";
        res = false;
    }
    else {
        if (!validarEmail(email)) {
            errores += "Please enter a valid email address\n";
            res = false;
        }
    }

    if( (comments==null) || (comments==""))
    {
        errores += "Please enter your comments\n";
        res = false;
    }

    if(errores!="")
        alert(errores);
    return res;
}

function trim(string)
{
    string = string.toString();
    return string.replace(/(^\s*)|(\s*$)/g,'');
}

function validarEmail(email)
{
    if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(email)){
        return true;
    }
    else
    {
        return false;
    }
}